Lennox Merit CBX25UH Series - Manuals

Page 3 - Requirements; WARNING; NOTES —; Installation Clearances; NON-DUCTED RETURN CLOSET INSTALLATION

Page 3 CBX25UH SERIES Requirements WARNING Excessive Weight Hazard - Use two or more peoplewhen moving and installing the unit. Failure to do so canresult in back or other type of injury. IMPORTANT The CBX25UH units are designed to match, and must beused with, outdoor units as rated. The indoor sect...

Page 4 - Installation; IMPORTANT

Page 4 If a return air plenum is used, the return air grille should beimmediately in front of the opening in the plenum to allowfor the free flow of return air. When not installed in front ofthe opening, there must be adequate clearance around theair handler to allow for the free flow of return air....

Page 5 - RIGHT-HAND AIR DISCHARGE; Figure 4. Remove Main Drain Pan Mounting Bracket; Figure 5. Remove Horizontal and Main Drain Pan

Page 5 CBX25UH SERIES 5. If the unit is suspended, the entire length of the cabinet must be supported. If you use a chain or strap, use apiece of angle iron or sheet metal attached to the unit(either above or below) to support the length of thecabinet. Use securing screws no longer than 1/2 inchto a...

Page 6 - Condensate Drain; Figure 9. Typical Main and Overflow Drain

Page 6 ROTATE BRACKET TO THISPOSITION AND REINSTALL REMOVE 2 SCREWSSECURING BLOW OFFPREVENTION BRACKET HORIZONTAL LEFT (FACTORY DEFAULT) HORIZONTAL RIGHT Figure 8. Blow-Off Prevention Plate Condensate Drain IMPORTANT On units of this type, where the blower “draws” rather than “blows” air through the...

Page 7 - Duct System and Filters; Model

Page 7 CBX25UH SERIES IMPORTANT A field-fabricated secondary drain pan, with a drain pipeto the outside of the building, is required in all installations over a finished living space or in any area that maybe damaged by overflow from the main drain pan. Insome localities, local codes may require a ...

Page 8 - INSTALLING DUCT SYSTEM; Connecting Refrigerant Lines; NOTE — Do not use soft solder.; Sealing the Unit

Page 8 IMPORTANT If a highefficiency filter is being installed as part of thissystem to ensure better indoor air quality, the filter mustbe properly sized. Highefficiency filters have a higherstatic pressure drop than standardefficiency glass/foamfilters. If the pressure drop is too great, system...

Page 9 - Electrical Connections; Electric Shock Hazard.; USE COPPER CONDUCTORS ONLY; GND; Using the wiring diagram located on the unit access

Page 9 CBX25UH SERIES Electrical Connections WARNING Electric shock hazard! - Disconnect allpower supplies before servicing. Replace all parts and panels before operating. Failure to do so can result in death or electrical shock. WARNING Electric Shock Hazard. Can cause injury or death. Foil‐faced...

Page 10 - Airflow — Cooling Blower Speed; CHANGE BLOWER SPEED; Locate pin number 2 on the blower relay. Two black

Page 10 R G AIR CONDITIONER UNIT R R G G BU W W BK COOLING‐ONLY APPLICATION AIR HANDLER THERMOSTAT HEAT‐ONLY APPLICATION AIR HANDLER THERMOSTAT COOLING APPLICATION WITH ELECTRIC HEAT AIR HANDLER THERMOSTAT HEAT PUMP APPLICATION WITH ELECTRIC HEAT NOTE - Connect common wire only if required (Refer to...

Page 11 - CHANGING BLOWER SPEED; Figure 13. Changing Blower Speed; All data given while air handler is operating with a dry DX coil.

Page 11 CBX25UH SERIES 2 BLUE (MED) RED (L0) BLACK (HI) YELLOW (COM) 5 BLOWER RELAY BLOWER RELAY PLASTIC CAPS 4-PIN BLOWER CONNECTOR HARNESS CHANGING BLOWER SPEED Figure 13. Changing Blower Speed NOTE — Refer to wiring diagram located on the unit access panel (or figure 13 above) and blower performa...

Page 12 - Motor ramps down to stop.

Page 12 Check-out Procedures NOTE - Refer to outdoor unit installation instructions forsystem start-up instructions and refrigerant charginginstructions. PRE‐START‐UP CHECKS S Is the air handler properly and securely installed? S If horizontally configured, is the unit sloped up to 5/8inch toward dr...

Page 13 - on the thermostat. They may also be; Maintenance; Cabinet Insulation; REPAIRING DAMAGED INSULATION

Page 13 CBX25UH SERIES second heat sequencer can be connected with the firstsequencer to W1 on the thermostat. They may also be connected to a second heating stage W2 on the thermostat subbase. EMERGENCY HEAT (HEATING HEAT PUMP) If the selector switch on the thermostat is set to theemergency heat po...